The Web 2.0 Guru has a great site, The Best Web 2.0 Resources for Relevant Educational Technology Integration.
On the site, there are tons of resources, sorted by different categories, that can be used in the classroom to help improve teaching and learning.
21st Century Learning, Blogging, Web Sites, Literacy, Copyrights, Ethics, Tutorials, and more.
This is a great place to start your search for tips and ideas on Web 2.0 resources.
There is also another page from the Web 2.0 Guru about Web 2.0 resources.
